Application: gvSIG desktop » gvSIG geoprocess

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007,2012 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 */

package org.gvsig.geoprocess.algorithm.buffer;

import com.vividsolutions.jts.geom.Geometry;

import com.vividsolutions.jts.geom.GeometryCollection;

import es.unex.sextante.dataObjects.IVectorLayer;

import org.cresques.cts.IProjection;

import org.gvsig.andami.PluginServices;

import org.gvsig.andami.ui.mdiManager.IWindow;

import org.gvsig.app.project.documents.view.gui.AbstractViewPanel;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.feature.EditableFeature;

import org.gvsig.fmap.dal.feature.Feature;

import org.gvsig.fmap.geom.exception.CreateGeometryException;

import org.gvsig.geoprocess.algorithm.base.core.GeometryOperation;

import org.gvsig.geoprocess.algorithm.base.util.GeometryUtil;

/**

 * Buffer operation

 * 

 * @author <a href="mailto:nachobrodin@gmail.com">Nacho Brodin</a>

 */

public abstract class BufferOperation extends GeometryOperation {

    public static final byte CAP_SQUARE = 0;

    public static final byte CAP_ROUND = 1;

    protected byte capBuffer = CAP_ROUND;

    protected int numberOfRadialBuffers = 1;

    protected IDistance distance = null;

    protected int id = 0;

    protected IVectorLayer layer = null;

    protected IProjection projection = null;

    protected double userDistance = 0D;

    public BufferOperation(IDistance distance, IVectorLayer layer,

        double userDistance) {

        this.distance = distance;

        this.layer = layer;

        this.projection = (IProjection) layer.getCRS();

        this.userDistance = userDistance;

    }

    /**

     * Verifys if a geometry buffer is null.

     * It is useful when you're working with internal buffers. If the internal

     * buffer distance is greater than the geometry radius, the buffer result

     * will be null.

     * 

     * @param newGeometry

     * @return

     */

    protected boolean verifyNilGeometry(Geometry newGeometry) {

        if (newGeometry instanceof GeometryCollection) {

            if (((GeometryCollection) newGeometry).getNumGeometries() == 0) {

                // we have collapsed initial geometry

                return true;

            }

        }

        return false;

    }

    /**

     * Adds a new feature

     * 

     * @param feature

     * @param newGeom

     * @throws CreateGeometryException

     * @throws DataException

     * @deprecated No es necesario porque no hay diferencia entre las llamadas

     *             entre ambos invoke

     */

    protected void addFeature(Feature feature, Geometry newGeom)

        throws CreateGeometryException, DataException {

        if (!(feature instanceof EditableFeature))

            lastEditFeature = persister.addFeature(feature, newGeom);

        else {

            org.gvsig.fmap.geom.Geometry g = GeometryUtil.jtsToGeom(newGeom);

            persister

                .addGeometryToExistingFeature((EditableFeature) feature, g);

        }

    }

    /**

     * Sets type of cap flag

     * 

     * @param typeOfCap

     */

    public void setTypeOfCap(byte typeOfCap) {

        capBuffer = typeOfCap;

    }

    /**

     * Sets number of radial rings buffers

     * 

     * @param number

     */

    public void setNumberOfRadialBuffers(int number) {

        numberOfRadialBuffers = number;

    }

    /**

     * <p>

     * Gets the measurement unit used by this view port for the map.

     * </p>

     * 

     * @return Returns the current map measure unit

     */

    protected int getMapUnits() {

        IWindow w = PluginServices.getMDIManager().getActiveWindow();

        if (!(w instanceof AbstractViewPanel)) {

            IWindow[] wList = PluginServices.getMDIManager().getAllWindows();

            for (int i = 0; i < wList.length; i++) {

                if (wList[i] instanceof AbstractViewPanel)

                    w = (IWindow) wList[i];

            }

        }

        if (w != null && w instanceof AbstractViewPanel) {

            IProjection proj =

                ((AbstractViewPanel) w).getMapControl().getViewPort()

                    .getProjection();

            if (proj.isProjected())

                return ((AbstractViewPanel) w).getMapControl().getViewPort()

                    .getMapUnits();

        }

        return 1;

    }

    /**

     * <p>

     * Returns the measurement unit of this view port used for measuring

     * distances and displaying information.

     * </p>

     * 

     * @return the measurement unit of this view used for measuring distances

     *         and displaying information

     */

    protected int getDistanceUnits() {

        IWindow w = PluginServices.getMDIManager().getActiveWindow();

        if (!(w instanceof AbstractViewPanel)) {

            IWindow[] wList = PluginServices.getMDIManager().getAllWindows();

            for (int i = 0; i < wList.length; i++) {

                if (wList[i] instanceof AbstractViewPanel)

                    w = (IWindow) wList[i];

            }

        }

        if (w != null && w instanceof AbstractViewPanel)

            return ((AbstractViewPanel) w).getMapControl().getViewPort()

                .getDistanceUnits();

        else

            return 1;

    }

}